How a PageLayout arranges the pages into spreads and the spreads into a strip.
public enum PageLayoutMode
ISO 32000-2 §7.7.2, Table 29 (PageLayout). Spec #33 story 54 (viewer capability 14).
kind:method, kind:property, kind:ctor. Press Esc to clear.ContinuousOne page per spread, the spreads in one scrolling column (OneColumn).HorizontalOne page per spread, the spreads in one scrolling row.SinglePageOne page per spread, one spread at a time (SinglePage).TwoUpTwo facing pages per spread, one spread at a time (TwoPageLeft, or TwoPageRight with a cover).TwoUpContinuousTwo facing pages per spread, the spreads in one scrolling column (TwoColumnLeft, or TwoColumnRight with a cover).